We are using Microsoft Exchange together with Active Directory and MOSS 2007. I want to accomplish the following:

Interest groups defined already in AD and used as Mailing Lists inside Exchange. How can we create a site in SharePoint for this Interest group and at the same time have a Forum inside that SharePoint site which also reflects the conversations done in the Exchange mailling list.

I was thinking if the forum could be a list, then the list could somehow subscribe to the Exchange list and recieve a copy of the conversation, and it would appear in the forum on the interest group.